Radiator-thermometer



Mmm/EVS G. P. PITKIN.

IRAmATORWTHERMOMETER.

APPLICATION FILED AUG.22|1919.

Patented June 7, 1921.

WIT/VES E8 UNITED STATES PATENT OFFICE.

GEORGE PHILO PITKIN, OF BERGNFIELD, NEW JERSEY. i

RADIATOR-THERMOMETER.

To all 'whom t may cof/wem.'

Be it known that I, GEORGE P. IrrKIN, a citizen of the United States, and a resident of Bergenfield, in the county of Bergen and State of New Jersey, have invented a new and Improved Radiator-Thermometer, of

which the following is a full, clear, and eX-I in connection with the radiators in general use and which is supported in and forms' a part of the cap or closure for the radiator.

lVith these and other objects in view the invention consist-s in certain novel features of construction, and combinations and ar-` rangements of parts, as will belmore fully hereinafter described and pointed out in the claims.

In the accompanying drawings- Figure l is a View partly in elevation and partly in longitudinal section illustrating my improvements;

F ig. 2 is a View atright angles to Fig. 1,v partly in longitudinalsection and-partly in elevation; and

Fig. 3 is a View in longitudinal section illustrating a modification. A

1 represents a casing' and 2 a tubular coupling which operates to connect the casing 1 with an internally screw threaded cap 3, the latter being adapted to screw onto the nipple ofv an ordinary automobile radiator.'

e coupling 2 has a reduced externally screw threaded end 4 engaging in a screw threaded socket 5 in the base of casing 1. An annular screw threaded flange 6 is made integral with the coupling 2 and serves to clamp the cap 3l. against the base of the casing 1 and also supports a perforated shield 11 screwed thereon and which will be more fully hereinafter described.

A. thermometer 7, preferably of glass, is secured in a longitudinal bore 9 in the lower portion of the casing 1 preferably by means of cement or other similar lmaterial 8 located between the tube 7 and the metal of Specification of Letters Patent.

`marks 17 on a backing p captions and markings.

' liquid is immaterial.

Patented June 7, 192,1.'

Application :filed August 22, 1919. Serial No. 319,172.

the casing. A bulb 1() is located on the lower end of the tube 'and housed within the shield 11, which latter protects the bulb against injury but does not interfere with the operation ofythe thermometer. An expansible liquid 12 is located within the bulb l() and a float indicator 13 is movablein the tube 7 and has an enlarged lower end 14 located in the bulb 1() and moved by means of the expansion and contraction of the li uid. A

`his float 13 constitutes an indicator and registers with suitable captions '16 and plate 15, which is secured in the casing 1. The captions and markings are readable at night because they are luminous or the surface of the backing plate is rendeld luminous to set ofi' the The upper end of the float 13 is colored, as indicated at 18, so that it can be readily seen as it registers with the markings on this reading can be done at night as well as in the day time.

Glass covered plates 19 are secured to opposite sides of the casing 1 by means of rings 2O and screws 21 so that the thermometer is protected from the Weather and is readable at all timesboth in the light and in t-he dark. l

In the modification illustrated in Fig. 3, a iioat 22 is employed which constitutes a hollow member filled with luminous substance so that it is readily seen in the dark. l/Vith this form of my invention I dispense with the enlargement 14, andv it is to be understood that when mercury is employed as an expansible liquid no enlargement of the `float is needed, but where other liquids are employed it is advisable to. have the enlarged end 14, as in the preferred form.

The theory is that the enlarged end used with liquids other than mercury provides a large vdisplacement with slight immersion. It acts asa weight to keepthe float centered in the tube and more readily follows the liquid in the tube. Thel highl specific gravity of mercury causes it to support almost any type of float successfully so that the exact shape of the float-used with this Various slight changes may be made in the general form and arrangement of parts described without departing from the invention, and hence I do not limit myself to and-scope of the appended cl-aims.

I claim:

1. 'A device of the character described, comprising a casing, a cap, a tubular coupling'connecting the casing and the cap, a tube projecting into the casing and having a bulb thereon outside of the casing, a perforated shield secured tothe coupling and inclosing said bulb, a float in the tube having a mark at its upper end, an expansible liquid in the bulb for moving the Hoat, a plate in the casing having luminously exhibited indicia registering with the marked .2. A devlce of the character described,

comprising a casing, a cap, a tubular coupling `connecting the casing and the cap, a tube projecting into the casing and having a bulb thereon outside the casing, a perforated shield secured to the coupling and inclosing said bulb, a float lin the tube having a mark at its upper end and an enlarged portion at its lower end, an expansible liquid in the bulb for moving the float, a plate in the casing having luminously eX- hibited indicia registering with the marked end of the float, and a transparent plate inclosing the casing.

GEORGE PHILO PITKIN, M. D. 

